Formerly dir-clear.c.~2~

1 files changed, 62 insertions, 0 deletions

diff --git a/libdiskfs/dir-clear.c b/libdiskfs/dir-clear.c
new file mode 100644
index 00000000..4b48b38c
--- /dev/null
+++ b/libdiskfs/dir-clear.c
@@ -0,0 +1,62 @@
+/* 
+   Copyright (C) 1994 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+
+/* Clear the `.' and `..' entries from directory DP.  Its parent is PDP,
+   and the user responsible for this is identified by CRED.  Both 
+   directories must be locked.  */
+error_t
+diskfs_clear_directory (struct node *dp,
+			struct node *pdp,
+			struct protid *cred)
+{
+  error_t err;
+  struct dirstat *ds = alloca (diskfs_dirstat_size);
+  
+  /* Find and remove the `.' entry. */
+  err = diskfs_lookup (dp, ".", REMOVE, 0, ds, cred);
+  assert (err != ENOENT);
+  if (!err)
+    err = diskfs_dirremove (dp, ds);
+  else
+    diskfs_drop_dirstat (ds);
+  if (err)
+    return err;
+  
+  /* Decrement the link count */
+  dp->dn_stat.st_nlink--;
+  dp->dn_set_ctime = 1;
+
+  /* Find and remove the `..' entry. */
+  err = ufs_checkdirmod (dp, dp->dn_stat.st_mode, pdp, cred);
+  if (!err)
+    err = diskfs_lookup (dp, "..", REMOVE | SPEC_DOTDOT, 0, ds, cred);
+  assert (err != ENOENT);
+  if (!err)
+    err = diskfs_dirremove (dp, ds);
+  else
+    diskfs_drop_dirstat (ds);
+  if (err)
+    return err;
+
+  /* Decrement the link count on the parent */
+  pdp->dn_stat.st_nlink--;
+  pdp->dn_set_ctime = 1;
+
+  return err;
+}